Means for attaching turbine-buckets.



- Wit/7655 as J. G. GALLAN. MEANS FOR ATTAOHING TURBINE BUGKETS.

APPLICATION FILED PBB.23,1906.

In Ve n Z01: John G. Cal/an, 1 I

PATENTED SEPT. 11, 1906.

mien sin urns ra rnnr orrion JOHN G. OALLAN, OF LYNN, MASSACHUSETTS,ASSIGNOR TOGENEKAL ELECTRIC COMPANY. A CORPORAIION OF NEW YORK.

MEANS FOR ATTACHING TURBlNE-BUCKETS.

Specification of Letters Patent.

Patented Sent. 11. 1906.

duplication filed February 23,1906. Serial No 302,427.

To all 1117mm, it may concern.-

Be it known that I, JOHN G. CALLAN, a citizen of the United States,residing atliynn, county of Essex, State of Massachusetts, have inventedcertain new and useful-Improvements in Means for Attaching TurbineBuckets, of which the following is a specific tion.

The present invention relates to means for attaching buckets ofelastic-fluid turbines to their support, and has for its object toprovide an improved arrangement whereby the buckets are securelyfastened in place or are readily removed when for any reason it becomesnecessary or desirable. v

In the accompanying drawings is illustrated embodiments of theinvention, Figure 1 being a partial view in elevation of abucketcarrying element. .Fig. 2 is a slightly-modified form, showingbuckets mountedupon the inside of a cylinder or drum. Fig. 3 is across-section through the bucket-base and securing means, and Fig. 4 isa similar section of a slight modification.

1 represents a bucket-carrying element. It may be stationary or rotary,as desired. The buckets may be mounted on the periphery, as shown inFig. 1, or on theinside, as

shown in Fig. 2. The surface arranged to receive the buckets is providedwith as many channels as there are rows of buckets. These channels arewider than the base 2 of the buckets and are provided with overhangingshoulders 3. These shoulders may be of any suitable shape. In Fig. 3,for example, a square shoulder is provided, and in Fig. 4 the wall 4 isinclined from the bottom to the top, thus giving to the channel the formof a dovetail in cross-section.

.The buckets 5 may be made. in any suitable way. For example, they maybe cut from solid stock, cast, or made of drawn stock cast into the base2.- The bases are made in segmental form of convenient length formanufacture. In o'ne'or-bo th sides of the foase are formed grooves 6,so arranged that a shoulder 7 is provided to receive the exposed end ofthe staking-piece 8. As shown in one embodiment of the invention, thestakingpiece, Fig. 3,00111PI'LS8S a flat port-ion 9', that extendsparallel with the bucket-fbase and has a projection 10, that hooks underthe overhanging shoulder 3 on the support and is held thereby. The otherend of the stakingpiece projects slightly beyond the surface of thesupport and is adapted to be bent over, as shown at l] to engage theshoulder on the base and hold the same rigidly in place. Thesestaking-pieces are preferably made in segmental form and are usually ofa length corresponding to'the length of a bucketseg'- ment. I may,however, make them longer or shorter, as desired. By making each .pieceof a length corresponding to that of a bucket-segment and'niatching thejoints it is a simple operation to assemble or remove thebucket-segments than where the staking pieces overlap the joints of thesegments.

In assembling the parts .the staking-pieces are first mounted inposition in a channel. Then the bucket-base is fitted into place betweenthe staking-pieces, and finally the ends of the staking-pieces are bentover to engage the shoulders on the bucket-base and hold the same inplace. These ends may be rolled into place by any suitable tool or bentover by a pneumatic hammer or or uivalent device. When for any reason itecomes necessary or desirable to remove a bucket-segment, the exposedend of each stakingpiece is cut oil with a cold-chisel which per- .mitsthe bucket-segment to be readily removed. In reassembling the parts newstaking-pieces are provided.

In Fig. 4 is shown a slight modification wherein thebucket-base-receiving channel in the support is made of dovetail shapein cross section as distinguished from the square shoulder shown in Fig.3. portion 9 of each staking-piece is thicker at the base than at theexposed end 8, so that when the latter is bent over any tendency for thebucket-base to pull out tendsto wedge the staking-pieces more firmlyagainst the side walls of the groove. It will be seen that in both casesthe walls of the channel overhang sutliciently to hold thestaking-pieces against radial strains' The remarks about assembling andtaking down the structure shown in Fig. 3 apply to the structure shownin-Fig. 4.

In Fig. 1 I have shown the buckets provided with a cover 12, made up insegments of suitable length and secured by tenonslS, formed integralwith the ends of the buckets. These covers may, howeven'be omitted, ifdesired.-

The body I In Fig. 2 the buckets are shown inside of a drum or othersupport 1, and the ends of the; buckets opposite-to the base are,uncovered;

My invention is applicable to turbines of theet type-and also'tomachines of the reaction an other types.

In aecordan'ce with the provisions-of the patent statutes I havedescribed theprineiple' ofoperation of my invention,'together with theapparatus whichlnowponsider to represent thebest embodiment thereof; butI desire to have it understood that the apparatus shown is onlyillustrative and that the invention can be carried out by other means.

What I claim asnew, and desire to'seeure. by Letters Patent of .theUnited States, is

1.1 In an elastic fluid turbine, the combination of a support having oneor more chann'els, a bucket-carrying base'mounted in the channel, andstaking pieces situated between the bucketbase and the Wallsof theQhanneL said staking-pieces being held by more'channels havingoverhanging shoulders on opposite sides, a bucket-carrying 'segmen ta]base mounted in the channel and provided with shoulders on oppositesides, and staking-pieces located between the sldesof the channel andthe *bucket-bzise, the inner ends of the stakmg-f 1eces being held inplace over to engage the said shoulders. 3. In an elast c-fluid turbine,the coinb1- nation of a support having a channel formed therein with anoverhanging wall,'a bu'cket' carrying base mounted therein and providedby, the support and the outer endsturned with a shoulder onjoneiside,and a staking.

piece located between the Wall of the channel and the bucket-base andsecured at its innerend by the'overhanging Wall of the channel, theouter end beingbent'over'to engage the shoulder on the bucket-base andsecure it'in place.

In witness Whereot 1, have hereunto set my hand1this2Qth day ofFebruary, 1906.

' JOHN .G. CALLAN Witnesses JOHN A. MeMANUs, Jr.,

HENRY 0.. WESTENDARPP

